Andreas Ericsson wrote: > Nicolas Pitre wrote: > > |nico@xanadu:linux-2.6> time git rev-list --objects --all > /dev/null > > | > > |real 0m21.742s > > |user 0m21.379s > > |sys 0m0.360s > > > > That's way too long for 1030198 objects (roughly 48k objects/sec). And > > it gets even worse with the gcc repository: > > > > |nico@xanadu:gcc> time git rev-list --objects --all > /dev/null > > | > > |real 1m51.591s > > |user 1m50.757s > > |sys 0m0.810s > > > > That's for 1267993 objects, or about 11400 objects/sec. > > > > Clearly something is not scaling here. > > > > What are the different packing options for the two repositories? > A longer deltachain and larger packwindow would increase the > enumeration time, wouldn't it? For the fun of it, I ran a test without deltas. Here's my normal git.git: $ du -h .git/objects/pack 26M .git/objects/pack $ git rev-list --all | wc -l 17638 $ git rev-list --all --objects | wc -l 82194 On a hot cache I get about 61800 objects/sec: $ /usr/bin/time git rev-list --all --objects >/dev/null 1.33user 0.04system 0:01.39elapsed 98%CPU (0avgtext+0avgdata 0maxresident)k 0inputs+0outputs (0major+8087minor)pagefaults 0swaps I then made a copy of that and repacked it without deltas (remember to remove *.keep, I tripped over that twice): $ git repack --depth=0 --window=0 -a -f -d Counting objects: 82906, done. Writing objects: 100% (82906/82906), done. Total 82906 (delta 0), reused 0 (delta 0) $ du -h .git/objects/pack 339M .git/objects/pack Which results in only 28739 objects/sec: $ /usr/bin/time git rev-list --all --objects >/dev/null 2.86user 0.11system 0:02.98elapsed 99%CPU (0avgtext+0avgdata 0maxresident)k 0inputs+0outputs (0major+50162minor)pagefaults 0swaps So maybe the GCC repository would need to be packed _better_? Unfortunately I cannot sensibly run the same test on linux-2.6.git, which is the next bigger git I have around: it inflates to about 3GB after the repack, which does not fit into memory. - Thomas -- Thomas Rast trast@xxxxxxxxxxxxxxx
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